#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
size_t My_str(char* p)
{
	char* star = p;
	while (*p)
	{
		p++;
	}
	return p-star;
}
int main()
{
	char arr[] = "hello world";
	printf("%zd\n", My_str(arr));
	return 0;
}
